摘要： 【目的】针对传统抑制剂在加成型硅橡胶高温下浸渍涂层工艺中易失效的技术瓶颈，开发具有宽温域且适用性优的新型抑制体系。【方法】选用炔醇类抑制剂 In-1和具有双齿配体结构的席夫碱抑制剂 In-2~In-7，比较其在液体硅橡胶催化交联过程中的抑制效果，系统研究席夫碱中配位原子种类和取代基对抑制性能的影响，并从 80 ℃下胶料的贮存稳定性、一定硫化温度下的硫化时间以及制品溶胀与力学性能这 3个方面评估不同抑制剂体系的综合性能。【结果】 N^N型席夫碱抑制剂 In-4展现最优抑制效果，相比 In-1，80 ℃下胶料贮存时间从 2h提升到 6h；胶料在优化的硫化温度（ 200 ℃）下，添加 0. 10 mmol In-4，获得的硅橡胶制品的拉伸强度为 3. 34 MPa，断裂伸长率为 317%，综合性能较好；在浸渍涂布工艺中，浸渍 60 s即可获得 0. 57 mm厚的功能涂层，满足大多数应用场景的涂层厚度要求。【结论】在 80 ℃下， In-4仍能有效抑制液体硅橡胶的加成交联反应，提高了胶料在使用过程中的稳定性，在硅橡胶浸渍涂层工艺中具有较好的潜在应用价值。系统的研究为高性能硅橡胶制品的工业化生产提供了重要的工艺参数指导。

关键词: 抑制剂, 席夫碱, 液体硅橡胶, 浸渍涂层

Abstract: ［Objective］To solve the failure of conventional inhibitor at high-temperature duringthe curing addition silicone rubber by dip-coating processes，this study aimed to develop a novel crosslinking inhibitor with broad temperature adaptability.［Methods］ The inhibition effects of bidentate Schiff-base inhibitors（In-2 to In-7）were comparatively investigated and compared with the commonly used acetylene alcohol inhibitor（In-1） in the liquid silicone rubber curing process. A systematic evaluation of coordination atom types（N^N，N^O，N^S）and substituent effects on inhibition performance was conducted through storage stability at 80 ℃，curing time at vulcanization temperature， swelling properties and mechanical properties of cured products.［Results］The N^N type Schiff-base inhibitor In-4 demonstrated optimal performance，extending the storage time at 80 ℃ from 2 h to 6 hwhile maintaining superior mechanical properties with the tensile strength and elongation at breakbeing 3. 34 MPa，317% respectively，at 0. 10 mmol loading. A functional coating with 0. 57 mmthickness was easily achieved by dip-coating for 60 seconds and met most requirements.［Conclusion］ The In-4 inhibitor suppressed effectively the hydrosilylation reaction at 80 ℃，and improved significantly in processing stability. The results above showed great potential applications in dip-coating field. The systematic studies also provided crucial process parameters for high-performancesilicone rubber production.

Key words: inhibitor, Schiff-base, liquid silicone rubber, dip-coating

中图分类号: 

• TQ637